Surface Component Regulation for Durable Li-Rich Layered Cathodes

Lithium-rich layered oxides (LLOs) represent appealing high-capacity and low-cost cathode candidates for advanced lithium-ion batteries. Nevertheless, severe capacity fading and voltage decay triggered by interfacial side reactions and irreversible phase transformations under high-voltage cycling greatly hinder their practical implementation. Herein, a weak acid ammonium salt-assisted precursor regulation strategy is employed to regulate the surface composition of Co-free LLOs. This modification helps alleviate interfacial and structural degradation during cycling. Benefiting from this modification, all treated samples achieve high capacity retention over 95% after 200 cycles at 1 C, distinctly outperforming the pristine counterpart. This precursor surface engineering strategy offers a facile route to stabilize LLO cathodes toward high-energy-density battery applications.